Chachamaru is a robot with a mechanical and magical power source created
by Satomi and Chao for Evangeline. She is essentially a technological golem. Karakuri
is the Japanese word for "machine" or "mechanism". Despite her robotic parts showing very
clearly, not many in her class actually seem to notice. As well as being Evangeline's
Ministra Magi, she performs maid duties at the cottage they share on the Mahora campus.
While Chachamaru displays few outward emotions, she spends most of her free time helping
people and rescuing stray animals, including regularly taking care of stray cats, and
is very popular with young children, who seem to know that she is a robot. She is also
in the go and Tea Ceremony clubs, but only because Evangeline is in those clubs as well
(the cha in her name uses the Kanji for "tea"). Perhaps because of the magic used in her
creation, Chachamaru begins to show human-like functions and emotions she was not programmed
for, such as her internal gears increasing in speed during moments where a human's heart
would beat faster, and even leaking lens-cleaning fluid from her eyes when she's upset.
The most likely trigger for this seems to be that she started developing feelings for
Negi after he stopped an attack on her when she was unable to defend herself, turning
his own Sagitta Magica spell back on himself rather than hurt his own student. Chachamaru
eventually rocket-punched Satomi, her own creator, out of embarrassment when she was about
to tell everyone about her crush on Negi, and nearly resulted in a complete breakdown
of her cognitive abilities.